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Please note that the recommended version of Scilab is 6.0.1. This page might be outdated.
See the recommended documentation of this function

Scilab help >> Elementary Functions > Floating point > clean

clean

cleans matrices (round to zero small entries)

Calling Sequence

B=clean(A [,epsa [,epsr]])

Arguments

A

a numerical matrix (scalar, polynomial, sparse, ...).

epsa, epsr

real numbers. Cleaning tolerances (default values resp. 1.d-10 and 1.d-10).

Description

This function eliminates (i.e. set to zero) all the coefficients with absolute value < epsa or relative value < epsr (relative means relative w.r.t. 1-norm of coefficients) in a polynomial (possibly matrix polynomial or rational matrix).

Default values are epsa=1.d-10 and epsr=1.d-10;

For a constant (non-polynomial) matrix clean(A,epsa) sets to zero all entries of A smaller than epsa.

Examples

x=poly(0,'x');
w=[x,1,2+x;3+x,2-x,x^2;1,2,3+x]/3;
w*inv(w)
clean(w*inv(w))
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Last updated:
Mon Oct 01 17:34:41 CEST 2012